TM-9-2320-362-14&P HMMWV Technical Manual Electrical Environmental System (EES) Download
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TM 9-2320-362-14&P 4-6. DIRECT SUPPORT TROUBLESHOOTING Table 4-1. Direct Support Troubleshooting MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. INCANDESCENT LAMP IS NOT LIT ON POWER INTERFACE BOX WHEN CIRCUIT BREAKER IS ON. NOTE When measuring +28 VDC, use ± 2 VDC for tolerance, WARNING Serious injury could result if safety pre- cautions are not followed when troubleshooting this equipment. Step 1. Turn off circuit breaker on power interface box. Step 2. Remove lens and incandescent lamp from power interface box . Step 3. Turn on circuit breaker. Step 4. Measure voltage at lamp socket. If multimeter does not read about +28 VDC, proceed to step 5. If multimeter reads about +28 VDC, turn off circuit breaker and replace incandescent lamp and lens (para. 3-31). Step 5. Measure voltage at terminal 11E4. If multimeter does not read about +28 VDC, proceed to step 6. If multimeter reads about +28 VDC, proceed to step 7. Step 6. Open battery compartment (TM 9-2320-280-20). Measure voltage at power stud. If multimeter does not read about +28 VDC, test batteries (TM 9-2320-280-20). If multimeter reads about +28 VDC, turn off circuit breaker and replace power cables (para. 4-19). Step 7, Remove power interface box cover. Measure voltage at load side of circuit breaker. If multimeter does not read about +28 VDC, replace circuit breaker (para. 4-8). If multimeter reads about +28 VDC, replace indicator light and wire assemblies (para. 4-9). 4-2